DELBRÜCK, dĕl'brük, Hans, German historian of military science: b. Bergen, Rügen, 1848. He was educated in Heidelberg, Bonn and Greifswald. He was an officer in the Franco-Prussian War and in 1874 became tutor to Prince Waldemar. He was a member of the Reichstag in 1882-83 and 1884-90 and after 1883 was on the editorial staff of the PreussischeJäahrbücher. He was appointed professor of modern history at the University of Berlin in 1885. He has written several important works on the art of war as practised within historic times. The more important of his works are ‘Die Perserkriege und die Burgunderkriege’ (1887); ‘Die Strategie des Perikles erlaüäutert durch die Strategie Friedrichs des Grossen’ (1890); ‘Friedrich, Napoleon, Moltke, Aeltere und Neure Strategie’ (1892); ‘Geschichte der Kriegskunst im Rahmen der politischen Geschichte’ (3 vols., 1900-07); ‘Erinnerungen, Aufsätze und Reden’ (1902).